What You'll Find at Mare Island Shoreline

Mare Island Shoreline Heritage Preserve is a 1,200-acre park along the Napa River in Vallejo that opens to public fishing and wildlife viewing. The preserve wraps around the northern edge of Mare Island, a former naval shipyard, and gives you access to tidal flats, salt marsh, and deep-water channels where striped bass, sturgeon, and leopard sharks move through with the tides. The park is free to enter and has parking, restrooms, and a paved path system that runs most of the shoreline—making it one of the few places in the Bay Area where you can fish from shore without scrambling over rocks or private property.

The water here is brackish, mixing fresh Napa River flow with San Pablo Bay tidal influence. That mix creates habitat that changes dramatically between high and low tide. At high tide, you can fish from the bank in deeper channels. At low tide, the flats expand and you can walk out to find fish in shallow pockets, though the mud can be slippery and the sun exposure is intense. Most anglers fish the channels and deeper edges rather than the flats, especially in summer when the flats warm up and fish move to cooler water.

Key Takeaways

  • Mare Island Shoreline is open year-round for fishing, with best results for striped bass from April through October and sturgeon in fall and winter.
  • The preserve has parking, paved paths, and restrooms, but no bait shop or tackle rental—bring everything you need from home.
  • Tides control where fish hold and how accessible the shoreline is, so check tide tables before you go and plan to fish the incoming tide when possible.
  • Striped bass here average 2 to 5 pounds, with occasional fish to 15 pounds; sturgeon are less common but can run 4 to 8 feet.

When to Fish and What to Expect

Spring and early summer (April through June) is prime time for striped bass. The fish move into the shallower channels as water warms, and you'll find them feeding on small baitfish in the early morning and late evening. Midday fishing is slower, especially in June when the water gets warm and clear. Fall (September through November) brings another strong bite as water cools and fish move back into the channels before heading to deeper winter habitat.

Sturgeon show up most reliably from October through February. They're bottom feeders that move through the channels on the tide, so you'll need to fish the bottom with live bait or cut bait—anchovy, herring, or shrimp work well. Sturgeon fishing here is unpredictable; you might hook one on your first cast or fish all day without a bite. Leopard sharks are common year-round and will take the same baits you're using for striped bass, though most anglers consider them a nuisance catch.

Tackle and Bait That Works

For striped bass, bring a medium-action rod (6 to 7 feet) with 10- to 15-pound line and a small tackle box of soft plastics, spoons, and topwater lures. White, chartreuse, and natural colors work best. If you prefer live bait, use small shiners, anchovies, or shrimp under a float or on a simple rig. Most anglers here fish artificials because they cover more water and the channels are relatively snag-free.

For sturgeon, you'll need a heavier setup: a 7- to 8-foot rod with 20- to 30-pound line and a three-way rig or simple sliding sinker rig that keeps your bait on the bottom. Use fresh anchovies, herring, or shrimp, and be patient—sturgeon bites can be subtle, and you may feel only a slow tap before the fish moves off. Check local regulations before you go; sturgeon have a minimum size (usually 40 inches) and a daily bag limit that changes by year.

Parking, Access, and Facilities

The main parking area is at the Mare Island Shoreline Heritage Preserve entrance on Azuar Drive, just off Sonoma Boulevard in Vallejo. The lot holds about 50 cars and is free. From there, a paved path system runs along most of the shoreline, with several access points to the water. The path is flat and easy to walk, though it can be crowded on weekends with joggers and dog walkers.

Restrooms are available near the parking area and at a second facility midway along the path. There is no bait shop, no tackle rental, and no food service on the preserve. Bring water, sunscreen, and everything you'll need to fish—the park is exposed and can get very hot in summer. Dogs are allowed on-leash, and the path is stroller-friendly, so you'll see families and walkers throughout the day.

Tides and How They Change Your Fishing

Tides here swing 4 to 6 feet between low and high, and they control where fish hold and how you can fish. On the incoming tide, fish move into the shallower channels and flats to feed, and that's when most anglers have success. The outgoing tide pushes fish back to the deeper channels, and fishing gets slower as the tide falls. Slack tide (the brief window between incoming and outgoing) is usually the slowest time.

At low tide, the flats expand and you can walk out to find deeper pockets where fish concentrate. The mud is slippery and the walk is long, so wear shoes with good grip and bring extra water. At high tide, the water comes up to the bank and you can fish from the path without wading. Check a tide table before you go—the National Oceanic and Atmospheric Administration (NOAA) publishes tide predictions for the Napa River, and timing your visit to the incoming tide will improve your odds significantly.

Regulations and What You Need to Know

California requires a fishing license for anyone 16 and older. You can buy a one-day license online through the California Department of Fish and Wildlife website or at most sporting goods stores in Vallejo. Striped bass have a daily bag limit (usually two fish) and a minimum size (usually 18 inches); sturgeon have a minimum size of 40 inches and a daily limit of one fish, though the season and regulations change by year. Check the current regulations on the Fish and Wildlife website before you fish.

The preserve itself has no special fishing restrictions beyond state law. The park is open dawn to dusk, and camping is not allowed. Fires are prohibited. If you catch and release, handle fish carefully and wet your hands before touching them—the sun and air dry them out quickly. The preserve is a working habitat for migratory birds and other wildlife, so stay on the path and respect closures if they're posted during nesting season.

Getting There and What to Bring

From downtown Vallejo, take Sonoma Boulevard north toward the Mare Island Bridge. Turn right on Azuar Drive and follow it to the preserve entrance. The drive is about 10 minutes from the city center. Parking is free and the lot rarely fills except on summer weekends. If the main lot is full, there is overflow parking nearby.

Bring a hat, sunscreen, and at least two liters of water—the preserve is exposed and there's no shade. Wear shoes with good grip if you plan to walk the flats at low tide. Bring your tackle, bait, and a small cooler if you want to keep fish. The path is paved but can be muddy near the water after rain, so consider waterproof boots. A headlamp is useful if you fish early morning or evening, and binoculars will help you spot birds and wildlife while you wait for bites.

Frequently Asked Questions

Can I fish here year-round?

Yes, the preserve is open dawn to dusk every day. Fishing is best April through October for striped bass and October through February for sturgeon. Winter weather can make the path muddy and the wind strong, but the preserve stays open.

Do I need a California fishing license?

Yes, if you are 16 or older. You can buy a one-day license online through the California Department of Fish and Wildlife or at sporting goods stores in Vallejo. The license is required even if you're only fishing for an hour.

What's the difference between fishing here and fishing the Napa River upstream?

Mare Island Shoreline is tidal and brackish, so you get striped bass and sturgeon that move with the tide. Upstream on the Napa River, the water is fresher and you'll find different species like largemouth bass and catfish. The shoreline here is also more accessible and has facilities, while upstream areas often require private land access.

Is it safe to eat fish from here?

Check the California Department of Fish and Wildlife website for fish consumption advisories. Some areas of the Bay have mercury or other contaminant warnings, especially for larger fish. Smaller striped bass are generally considered safer than large ones.

Can I bring my dog?

Yes, dogs are allowed on-leash throughout the preserve. The paved path is dog-friendly and most of the shoreline is accessible with a leashed dog, though the muddy flats at low tide can be messy.